Increase default randomness for integer generators (#59)

* Increase default MAX_INT random generator

I think 10000 is just too low. 
Wwe have been having flakyness on our tests with UNIQUE constraints on Integer columns because of conflicting values we this generator.

* Add dynamic integer ranges from Django's bounds

* Formatting

* Add more generator ranges for other types of integer fields

* Update changelog

Co-authored-by: Bernardo Fontes <bernardoxhc@gmail.com>

CHANGELOG.md

@@ -10,14 +10,15 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 
 ### Changed
-<<<<<<< HEAD
+
 - Improve code comments [PR #31](https://github.com/model-bakers/model_bakery/pull/31)
 - Switch to tox-travis [PR #43](https://github.com/model-bakers/model_bakery/pull/43)
 - Add black job [PR #42](https://github.com/model-bakers/model_bakery/pull/42)
 - README.md instead of rst [PR #44](https://github.com/model-bakers/model_bakery/pull/44)
 - Add Django 3.0 and Python 3.8 to CI [PR #48](https://github.com/model-bakers/model_bakery/pull/48/)
 - Add `start` argument to `baker.seq` [PR #56](https://github.com/model-bakers/model_bakery/pull/56)
 - Fixes bug when registering custom fields generator via `settings.py` [PR #58](https://github.com/model-bakers/model_bakery/pull/58)
+- The different IntegerField types now will generate values on their min/max range [PR #59](https://github.com/model-bakers/model_bakery/pull/59)
 
 ### Removed
 

model_bakery/generators.py

@@ -1,3 +1,4 @@
+from django.db.backends.base.operations import BaseDatabaseOperations
 from django.db.models import (
     BigIntegerField,
     BinaryField,
@@ -31,6 +32,18 @@
 from . import random_gen
 from .utils import import_from_str
 
+try:
+    from django.db.models import AutoField, BigAutoField, SmallAutoField
+except ImportError:
+    AutoField = None
+    BigAutoField = None
+    SmallAutoField = None
+
+try:
+    from django.db.models import PositiveBigIntegerField
+except ImportError:
+    PositiveBigIntegerField = None
+
 try:
     from django.contrib.postgres.fields import ArrayField
 except ImportError:
@@ -58,17 +71,26 @@
     CITextField = None
 
 
+def _make_integer_gen_by_range(field_type):
+    min_int, max_int = BaseDatabaseOperations.integer_field_ranges[field_type.__name__]
+
+    def gen_integer():
+        return random_gen.gen_integer(min_int=min_int, max_int=max_int)
+
+    return gen_integer
+
+
 default_mapping = {
     ForeignKey: random_gen.gen_related,
     OneToOneField: random_gen.gen_related,
     ManyToManyField: random_gen.gen_m2m,
     BooleanField: random_gen.gen_boolean,
     NullBooleanField: random_gen.gen_boolean,
-    IntegerField: random_gen.gen_integer,
-    BigIntegerField: random_gen.gen_integer,
-    SmallIntegerField: random_gen.gen_integer,
-    PositiveIntegerField: lambda: random_gen.gen_integer(min_int=0),
-    PositiveSmallIntegerField: lambda: random_gen.gen_integer(min_int=0),
+    IntegerField: _make_integer_gen_by_range(IntegerField),
+    BigIntegerField: _make_integer_gen_by_range(BigIntegerField),
+    SmallIntegerField: _make_integer_gen_by_range(SmallIntegerField),
+    PositiveIntegerField: _make_integer_gen_by_range(PositiveIntegerField),
+    PositiveSmallIntegerField: _make_integer_gen_by_range(PositiveSmallIntegerField),
     FloatField: random_gen.gen_float,
     DecimalField: random_gen.gen_decimal,
     BinaryField: random_gen.gen_byte_string,
@@ -100,6 +122,17 @@
     default_mapping[CIEmailField] = random_gen.gen_email
 if CITextField:
     default_mapping[CITextField] = random_gen.gen_text
+if AutoField:
+    default_mapping[AutoField] = _make_integer_gen_by_range(AutoField)
+if BigAutoField:
+    default_mapping[BigAutoField] = _make_integer_gen_by_range(BigAutoField)
+if SmallAutoField:
+    default_mapping[SmallAutoField] = _make_integer_gen_by_range(SmallAutoField)
+if PositiveBigIntegerField:
+    default_mapping[PositiveBigIntegerField] = _make_integer_gen_by_range(
+        PositiveBigIntegerField
+    )
+
 
 # Add GIS fields
 

model_bakery/random_gen.py

@@ -21,7 +21,7 @@
 MAX_LENGTH = 300
 # Using sys.maxint here breaks a bunch of tests when running against a
 # Postgres database.
-MAX_INT = 10000
+MAX_INT = 100000000000
 
 
 def get_content_file(content, name):